Effect of Ti on the Mechanical Properties and Corrosion of Cast AZ91 Magnesium Alloy
Effect of Ti on the Mechanical Properties and Corrosion of Cast AZ91 Magnesium Alloy
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DOI：
10.2174/1874088x01206010006
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发表时间：
2012-02
期刊：
影响因子：
--
通讯作者：
X. Ai;G. Quan
中科院分区：
文献类型：
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作者：
X. Ai;G. Quan
采用常规铸造方法研究了钛在AZ 91镁合金中的添加量。并对其显微组织和力学性能进行了测试。采用恒浸泡失重法和动电位极化曲线法研究了不同Ti含量合金在3.5%NaCl溶液中的耐蚀性。结果表明，Ti的加入量为0.1~0.5%wt时，铸态组织得到细化。相的形貌由粗大、不均匀、半连续的骨架状网络转变为细小、均匀、短棒状或颗粒状。当Ti含量为0.4wt%时，抗拉强度和伸长率达到最大值，分别为197 MPa和6.9%。Ti元素的加入提高了合金的耐蚀性，这与合金中相的形态和分布有关。讨论了钛提高合金力学性能和耐蚀性能的机理。
Ti addition to AZ91 alloy was been investigated with conventional casting. The microstructure and mechanical property were examined. The Corrosion resistance of all the different Ti addition content alloy was studied in 3.5% NaCl solution through weight loss measurement in constant immersion conditions and potentiodynamic polarization experiments. The results show that addition of Ti with an amount of 0.1~0.5%wt resulted in a refinement of the as-cast microstructure. The morphology of phases is changed from coarse, uneven, semi-continuous skeletal network to small, uniform, short rod-like or granular. When the content of Ti is 0.4wt%, the tensile strength and elongation go up to maximum value of 197 MPa and 6.9% respectively. The corrosion resistant improved through addition Ti element is related to the morphology and distribute of phases. The mechanism of mechanical properties and corrosion resistant improvement caused by Ti addition is discussed.